.gitlab-ci.d/crossbuilds.yml: Force 'make check' to -j2 for cross-i686-tci

.gitlab-ci.d/crossbuilds.yml: Force 'make check' to -j2 for cross-i686-tci

In commit 1374ed49e1453c300 we forced the cross-i686-tci job to -j1 to
see if this helped with test timeouts. It seems to help with that but
on the other hand we now sometimes run into the overall 60 minute
job timeout. Try -j2 instead.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-ID: <20240916134913.2540486-1-peter.maydell@linaro.org>
Signed-off-by: Thomas Huth <thuth@redhat.com>